Apparatus for thermo-humidity control



F.'D. WIND-ELL.

APPARATUS FOR THERMO HUMIDITY CONTROL.

APPLICATION FILED JUNE 10, 1914. RENEWED DEC. 10.1915.

1 9 1 9Ufi97, Patented July 11, 1916.

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WITNESSES 11111511101:

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F. D. WENDELL.

APPARATUS FOR THERMO HUMIDITY CONTROL.

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FRANK I). IWINDELL, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE-HALFT0 a HENRY LEWIS WILLIAll/IS, 01E PITTSBURGH, PENNSYLVANIA.

nrrana'rns FOR THEItMQ-HUMIDITY CONTROL.

Specification of Letters Patent.

Patented uly 11, 1916..

Original application filed May 6, 1913, Serial No. 765,838. Divided andthis application filed June 10,1914,

1 Serial No. 844,383. Renewed December 10, 1915. Serial No. 66,218.

method and apparatus of thermo-humidity control.- I i This inventionrelates to an apparatus for automatically controlling the temperatureand humidity in a room, apartment or. in any number of rooms andapartments or the like, and has for an object to provide a system whichis complete, unitary and sufficiently sensitive to maintain theapparatus in a normal condition for any predetermined temperature orpredetermined degree of moisture.

It further consists of means for mixing heated air with cold or temperedair in definite proportions according to a predetermined desiredcondition of the mixed fluid, such condition being dependent upon theamount of moisture in the mixed air and the temperature of that air. Themixed air resulting from combining a supply of heated air with a supplyof cold or tempered .air is treated by introducing at a suitablepoint,'saturated vapor preferably in the form of steam, andthereafterautomatically varying the proportions of heated air with thecold or tempered air and also regulating the quantity of vapor addedthereto,"

both of these steps being independently controlled according to desiredconditions,

and each being independent of the other.

My invention further consists in the utilization of electricity as ameans for accomplishing the desired regulation of mixed heating fluidand moisture in such fluid,

whereby an apparatus employed for the same is rendered extremelysensitive and dependable for carrying out the steps to the desired end.My invention further consists in providing an auxiliary governing devicefor' controlling the fuel consumption and which automatically is broughtinto operation whenever conditions in all of the rooms are such as torequire simultaneous reduction of the temperature in each of the roomsor the simultaneous reduction of the degree of I moisture in the air ineach of the rooms being heated or supplied with moisture.

further consists of other novel features of construction all as will behereinafter fully set forth.

For the purpose of illustrating my invention, I have shown in theaccompanying drawings, one form thereof which is at present preferred byme, since the same will be found in practice to give satisfactory andreliable results, although it is to be understood that the variousinstrumentalities of which my invention consists can be Variouslyarranged and organized and that my invention is not limited to theprecise arrangement and organization of these instrumentalities asherein shown and described.

Figure 1 represents a diagrammatic arrangement of an apparatus forcarrying out my invention, the same showing the apparatus and itsconnection as installed for two rooms; Fig. 2 representsdiagrammatically'a plan of the installation of an apparatus for heatingand controlling a number of rooms. Fig. 3 represents a vertical sectionof a pressure controlled diaphragm valve used in connection with mysystem. Fig. 4 represents a vertical section of an electricallycontrolled valve for governing heat and humidityconditions in accordancewith the actuation of certain regulating devices.

I have illustrated in the accompanying drawings one form of apparatus bymeans of which my invention may be practised,

and in View of the fact that a number of the control and regulatingdevices are idemtical, havefor the sake of clearness, described but oneof such devices where others on other parts of the system are duplicatesthereof.

Similar numerals of reference indicate corresponding parts in thefigures.

Referring to the drawings, the reference numeral 1 indicates a boiler orsimilar generator, having a flue 2, leading to a stack or chimney 3.. Achamber 100 has communication with the outer air through a freshairintake 101 and with a tempering coil 102, through which the fresh airpasses, and

has its temperature suitably increased,

the several rooms or apartments to be "heated. A duct," 6, for cold ortemper (1 air communicates with each of said hot air ducts. It will beunderstood that normally there are as many hot-air ducts 4 and 5 asthere are rooms to be heated, and in View of the fact that each air ducthas its own controlling apparatus, all parts thereof bev ing identical,it is not thought necessary to' unduly burdenthe description withdetailed explanations of duplicate parts, and therefore the descriptionwill be confined to the apparatus controlling the room with which theduct 4 communicates.

7 designates a pivoted damper positioned in the cold air duct 6 andconnected'by a link 8 to a second pivoted damper 9 located in the heatedair duct 4, the one of course controlling the supply of heated air andthe other the supply of cold or tempered air, so that the air which ismixed after passing the two dampers is delivered to the room at atemperature predetermined by the setting of the regulating devices. Itwill be noted that the two dampers 7 and 9 are connected so as to besimultaneously operable, the one being'open or partially open, while theother is closed or partially closed,

and both are operated in the present instance through the medium of arod 10 connected to the lever arm 11 of a diaphragm valve or pressuremotor 12, the said lever arm 11 being fulcrumed at 13, so that theoperation of the arm 11 will cause the damper 7 to move toward the openposition while the damper 9 correspondingly moves to the closedposition.

14 designates a pipe for conveying pressure fluid to the motor 12 and isin communication with a valve'casing 15 by way of the port 16 as shownin Fig. 4.

17 designates the inlet port for the casing 15, which in the presentinstance is formed in a nipple 18 having screw-threaded engagement withthe casing 15 and provided with a valve seat 19, as will be apparent.Pressure fluid is supplied to the inlet 17 and casing 15 by way of thelive pipe line 20, which is under pressure of the receiving tank 21connected by pipe 22 to the air compressor 23, which may of course be ofany desired or well known type for the purpose.

24 designates the valve plug for control ling the inlet port 17 and thesame in the a present instance is provided with the conical ends 25 and26, the former engaging the seat 19 to control the opening and closingof the inlet 17, while the latter in a similar manner controls theexhaust port 27 of the 4 casing 15, which relieves the pressure in thepipe 14 at the proper time. As here shown, the valve plug 24 is providedwith a flange or collar 28, which serves as an abutment for a spring 29,which is interposed between the said abutment and the nipple 18 andlifts the valve to open position under certain conditions to bepresently described. The valve 24 just described is utilized at a numberof places in the system for controlling the fluid pressure to diaphragmvalves of one type or another, and in order that the operation of thesystem may more readily be understood, I have designated this valve as aunitary structure by the reference letter A and the remaining valvessimilar thereto by the letters B, C, D, E and F, all of which areoperated and controlled in the present instance by electrical meansembodying the following structure.

30 designates a pair of electro-magnets each having a core 31 adjustablysecured by bolts 32 or the like to the plate 33 of the valve casing 15,so that these parts remain in fixed position. 34 designates the armaturefor these magnets, which is suitably disposed adjacent the poles of themagnets and mounted upon the threaded stem 35, which is positioned inalinement with the projecting stem 36 of the valve plug 24 and undernormal condition,'the said stem is in engagement with the valve plug andholds the valve closed until such time as the electroma nets areenergized.

3,1 designates the upper core plate of the magnets, which is preferablyapertured to receive the end of the stem 35, which termi-. nates inopposed relation to a thumb adjusting screw 38 threaded into a yoke 39fixed to the magnet frame by screws 40 or the like.

41 and .42 designate binding posts for the conductors carrying thecurrent to the aforesaid electro-magnets.

43 designates a spring interposed between a suitable fixed plate 44 andadjusting nuts 45 upon the stem 35, the said spring being stiffer andstronger than the spring 29 of the valve member 24, so that the stem 35under normal deenergized condition, engages the stem 36 of the valve andmaintains the latter in closed position.

46 designates adjusting nuts for the end of the stem 35, so that thelatter may be relatively adjusted to the stem 36, as will be readilyunderstood.

1 The operation of this valve is as follows Whenever a circuit is closedthrough the magnets 30 the armature 34 will be drawn toward the magnetand in a direction to carry the stem 35 away from or out of contact withthe valve stem 36, whereupon the spring 29 will actuate the valve plug24, so

that the exhaust port 27 is closed and the inlet '17 opened and pressureis thereupon supplied to the pipe 14 from the live line 20. In thepresent instance, it have utilized the armature 34 as a circuit closerfor an auxiliary circuit, the terminals of which are shown anddesignated by the reference numerals 47 and 48, the said terminals beingso positioned that whenever the armature 34 is drawn toward the magnets,it will contact with the aforesaid terminal and close a circuit, whichwill later be described.

The above description relates entirely to the control mechanism for thetemperature ducts with the omission of the automatic regulating devicesfor such control mechanism, sinceit is thought that the operation andconstruction will be clearer by leavlng the automatic feature untillater. The description of the humidity control mechanism will thereforenow be taken u in detail.

49 designates a nozzle suitably positioned to discharge into the duct 4at a point beyond the two dampers 7 and 9, and it is controlled in thepresent instance by means of a diaphragm motor 50 constructed in thepresent instance as follows.51 and 52 des ignate respectively sectionsof the casing of the motor- 50, whichin the present instance are inthreaded engagement as shown at 53, and clamp between them the diaphragmplate 54. This latter is formed of flexible material and divides thecasing into the chambers 55 and 56, the latter having communicationthrough the port 57 with the inlet 58 of the casing section 52. 59designates a valve plug suitably fixed to the diaphragm 54 and servingas a control means for the outlet 60 of the section casing 52. The plug59 has an extension 61 on the opposite side of the diaphragm'54, whichis suitably guided in the recess 62, which communicates by way of thethreaded opening 63 with a pipe 64 leading to the valve B, which isconnected with the live line or pipe 65 from the receiving tank 21. Thenozzle 49 is connected to the outlet 60, while the inlet 58 communicateswith the live steam or vapor line 66, the latter being supplied from agenerator 67. 68 designates the smoke flue of the generator 67, whichcommunicates with the stack 69, the regulation of which willpresently bedescribed.

From the above description, it will be apparent that when theelectro-magnets 30 of the valve B are energized, pressure fluid will beadmitted from-the live line 65 to the pipe 64 and conveyed to the motor50, which is thereupon actuated to close the valve 59 and cut off thesupply of saturated vapor or steam to the nozzle 49, since the pressureof said fluid admitted back of the valve extension 61. is always greaterthan the pressure inthe steam or vapor line 66. Under normal conditions,therefore, the valve 59 will be maintained open by the pressure. of thesteam from the generator 67 and the mixed air in the duct 4 will besupplied with saturated vapor sufficient to maintain the predeterminedconditions of humidity.

It will now be apparent that the valves A and B respectively control thetemperature and humidity of the air delivered to a given locality orroom, and the description of the means for automatically controllingthese two valves will now be taken up in detail, together with thecomplete unitary operation of the system. In connection with thisdescription, it will be noted that the reference letters G and Hdesignate sets of instruments respectively located in the room to becontrolled, there being of course as many sets-of these instruments asthere are rooms to be regulated, and therefore but one set ofinstruments will be described in detail.

7 0 designates a dry bulb thermometer and 71 a wet bulb thermometer,both instrumen-ts being of well-known construction and of any desiredtype for the purpose in View. ,7 2 designates a wire leading from thebattery 73 and forming the c'ommon return for nal sealed into the bulbat a predetermined point, namely, the one corresponding to the highesttemperature desired or temperature to be maintained in a given room. Theterminal wire 7 5 is connected by a wire 7 6 to the binding post 41 ofthe electro-magnet controlled valve A and the circuit is completedthrough the electro-magnets, binding post 42 and wire 77 back to thebatter a switch 78 being interposed in this line, if desired. 7 9designates an incandescent light connected in parallel with theelectro-mag net in order to flash a signal to indicate that this valveis operated, this often being a useful source of information to theoperator in control of the system.

82 to wire 77 to the battery; The closing of either of the foregoingcircuits energizes the electro magnets 30 and allows the plug valve 24to open and admit pressure fluid to the control motors for e ther thedampers 7 and 9 or the humidity nozzle 49, depending of course uponwhether the wet or dry bulb has closed the circuit. Of course, shouldboth instruments close their respective circuits simultaneously, thenboth the damper control and humidity nozzle would simultaneously beactuated, the one being opened to admit cold or tempered air, while theotherwould be cut ofl entirely.

In the operation of a system such as above described, it occurs more orless frequently generators, and for this purpose, I provide a damper 83located in the flue 2 and controlled 'by a pressure motor 84 similar tothe motor I2 heretofore described. The motor 84 is actuated by pressurefluid transmitted by the pipe 85 from the live line 20 and controlled bythe electro-magnet actuated valve E so asto open and close the damper 83at the times desired, the opening of the latter, of course, creatingmore, draft in the generator, and the closing thereof checking thegenerator, The mechanism for controlling the humidity generator 67 issubstantially similar, since it comprises a damper 86 located inthe flue68 andcontrolled by a. pressure motor 87 controlled by pressure fluidsupplied by the pipe 88. This pipe-conmeets with the outlet 16 of theelectro-magnetic control valve F and receives pressure fluid from thelive pipe 65 as heretofore explained. The two valves E and F thereforebecome respectively a controlling means-for the temperature and thehumidity of the entire system, and operate in exactly the same manner asdo the same valves which control conditions for the individual rooms.The circuit for energizing the magnets of the valves E and F,is,however, a separate and different circuit than those heretofore described, since it is-controlled by the. simultaneou's-actuation of allthe armatures 34 of either the temperature magnets or the humiditymagnets as the case may be. Thus for example, should all the roomssimultaneously reach an excess temperature, the

armatures of the valves A'and C of Fig. 1 will be operated to closetherespective terminals 47 and 48, thus closing the circuit by way of thewire 89, contacts 47 and 48, armatures 34,'electro-'magnetsof valve Eand return to the battery by wire 77. The humidity control governorvalve F is similarly and cold or tempered air.

operated by the simultaneous actuation of the valves B and D, so as toclose a circuit from battery 73, conductor 89, contacts 47 and 48,armature 34 of valves B and D,

electro-magnets of valve I" andreturn by conductor 82 to conductor 77 tothe battery. InFig. 2 I have shown a plan of a system embodying myinvention wherein the apparatus is arranged to supply a large number ofrooms and in which I have designated the parts for convenience with theeter 71 connected in accordance with the foregolng description and eachroom also of course is connected with the heating plant by a duct suchas 4 receiving both heated In starting the apparatus, it will be assumedthat the room is cold and therefore the mercury in the instruments is ata point below the terminals 75 and 80, while the dampers 7 and 9 arepositioned so as 'to close the cold or tempered air supply and open theduct 4 to heated air only. With this heated air the vapor from nozzle 49is mixed and supplies the room with warm air saturated to thedesiredcondition. As the temperature 'rises, the mercury in both the wet anddry bulbs expands until the contact of the mercury in the dry bulbengages the adjusted terminal 75, it of course being apparent that themercury in the wet bulb rises much more slowly owing to the evaporationof the mois:

ture upon the same. Considering the room in which the instruments G arelocated to be the one under discumion, contact of the mercury with theterminal 75 will close the circuit through the electro-magnets 30 ofvalve A and also simultaneously flash the indicator light 79. Theenergizing of these magnets raises the armature 34 and allows the spring29 to open the inlet valve 17 and permit the pressure fluid to. enterthe pipe 14 and actuate the pressure motor 12. This action operatesdampers 7 and 9 so that the former is opened while the latteris closedand thus the room is immediately supplied with air at a lowertemperature causing a reduction of temperature in the room. As soon asthis reduction affects the dry bulb 70. the mercury contracts and breaksthe circuit just established 'where-' upon the spring 43 of the valve Areturns-- the armature to its former position and at the same time thestem 35 strikes the valve plug24 and returns it to closed position allwing the pipe'14 to exhaust thro gh the port 27. As a result of thisaction the dampers 7 and 9 are swung in the reverse direccury in the wetbulb 71 to rise until a circuit is closed by its contact with theterminal 8O whereupon a circuit is closed through the electro-magnetvalve B and pressure fluid admitted by way of pipe 64 to the motor 50which thereupon cuts off the supply of vapor to the duct 4.

In the event that the automatic regulating instruments in each room areall simultaneously actuated to reduce the temperature, the energizationof the two valves A and C will cause their armatures to close thecircuit through the valve E whereupon pressure fluid is admitted to thepipe 85 and causes the motor 84.- to close the check damper of the mainheater 1. In case all the rooms simultaneously actuate the humiditycontrol the operation of the armatures or valves B and D will close thecircuit through the electro-magnet valve F thus admitting pressure fluidto the pipe 88 and closing the damper 86 of the humidity generator so asto check the supply of vapor to all of the rooms.

It will now be apparent that I have devised a novel apparatus forregulating the temperature and humidity of aroom or a number of rooms,wherein the temperature controlled mechanism and the humidity controlledmechanism are independently operable in the same system andautomatically control and regulate the mixing of the room heatingmedium. It will further be seen that by this novel system the supply ofmoisture to the heating medium for any particular room requiring moremoisture or any combination of rooms requiring the same is automaticallycontrolled by a regulator actuated by the wet bulb controlling thatroom, so that the supply of moisture necessary is delivered to thatroom, and the humidity thereof raised to the desired point.-

In a similar,manner, if the rooms require less heat, the temperatureregulator will automatically cut down the supply of heat regardless ofwhether the rooms require more moisture or not. It will further beapparent that by my novel system I am enabled not only to control andregulate the temperature of any particular room or any group of roomsbut in connection therewith.

I have provided a novel automatic governing mechanism for simultaneouslycontrolling the temperature and humidity of allthe rooms together byacting directly upon the heat and humidity generators. This governingsystem is, however, actuated only at the time when all of the rooms inthe system are simultaneously demanding less heat or less humidity andit therefore acts as a safety governor for directly regulating the fuelconsumption. It will further be apparent by my novel apparatus for heatregulation that the temperature change or hu-. midity change required toactuate the various mechanisms is very slight and it will therefore beunderstood that the device in so far as the temperature is concernedaccomplishes automatic mixing. By automatic mixing I mean that onaccount of the fact that the mixing dampers are adjusted to move veryslowly, approximately three minutes being required to change them fromone position to the other through substantially thecomplete movement,and in view of the fact that an extremely slight opera tion of thedamper will make or break the electric control circuit, the mixingdampers are started on the up stroke before they have completed the downstroke, that is to say,

after the temperature of the room has fects the mixing dampers, so thatthe latter are practically 111 constant motion either up or down toproduce an automatic mixing of the heated supply. It will further beapparent that changes in the wet bulb damper 9 will actuate themechanisms in the same way, and a very slight difference in the humiditywill cause practically an instantaneous variation in the humiditysupply, owing to the extreme sensitiveness of the automatic devices. Itwill further be apparent that While I have described the device as usedin connection with an indirect heating system, as shown in Fig. 2, thesame is readily applicable to direct systems of heat ing and may beadapted readily to any of the direct known systems in use where theheating surface is Placed in the room itself to. be heated.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. In a. device of the character stated, a source of temperaturechanging medium and a source of humidity changin medium, incommunication with a plurality of. in-

\ closures, and means for controlling said and relative humiditiesmaintained in the other inclosures.

2. In a device of the character stated, a source of temperature changingmedium and a source of humidity changing medium in communication with aplurality of inclosures, and means for automaticallycontrollingsaidsources for maintaining a predetermined temperature and a predeterminedrelative humidity in each of the plurality of inclosures, irrespectiveof the temperatures and relative humidities maintained in the otherinclosures.

3. In a device of the character stated, in-

4:. In a device of the character stated, in

dependent means controlled by the temperature andrelative humidity ofeach of a number of inclosures to respectively control and maintain thetemperature and humidity of each of said inclosures at predeterminedfixed points, and means controlled by the humidity of all of saidinclosures under predetermined conditions to control the main source ofhumidity supply to all of said inclosures.

5. In a device of the character stated, independent means controll d bythe temperature and relative humidity of each of a number of inclosures,to respectively control and maintain the temperature and humidity ofeach of said inclosures at predetermined fixed points, and meanscontrolled by the humidity and temperature of all of said inclosuresunder predetermined conditions to control the main supplies oftemperature changing medium and humidity changing medium to all of saidinclosures.

6. In a device of the character stated, a source of temperature changingmedium and I of humidity changing medium in communication with aplurality of inclosures, means for admitting a mixture of saidtemperatur changing medium and air of normal temperature to each of saidinclosures, means in each inclosur'e influenced by the temperaturetherein for automatically controlling the degree of mixture for eachinclosure, means for admitting humid vapor into said mix ture for eachindividual inclosure, means in each inclosure influenced by the degreeof humidity therein for automatically control ling such admission foreach inclosure, and means for automatically indicating which meansis inoperation.

7. In a device of the character stated, a source of temperaturechangingmedium and of humidity changing medium in communication with a pluralityof inclosures, means for individually controlling the introduction ofthe temperature and humidity changing mediums into each inclosure tomaintain the temperature and humidity therein ata predetermined standardirrespective of the standard in another inclosure, and means forautomatically and individually indicating when the temperature andhumidity of each room is at or below the predetermined standard.

8. In a device of the character stated, a source of temperature and ofhumidity changing mediums in communication with a plurality ofinclosures, means for controlling the introduction of the temperatureand humidity changing mediums into each of the plurality of inclosuresto maintain a predetermined temperature and a predetermined relativehumidity in each of said plurality of inclosures, irrespective of thetemperatures and relative humidities maintained in the other inclosures.

9. In a device of the character stated, a source of temperature and ofhumidity changing mediums in communication with a plurality ofinclosures, and means controlling automatically and separately theintroduction of the temperature and humidity changing mediums into eachof the plurality of inclosures to maintain a predetermined temperatureand a predetermined relative humidity in each of the plurality ofinclosures, irrespective of the temperm tures and relative humiditiesmaintained in the other inclosures.

10. In a device of the'characterstated, a source of temperature andhumidity changing mediums in communication with a pinrality ofinclosures, means for introducing the temperature changing medium toeach of said inclosures, means in each inclosure influenced by thetemperature therein for automatically controlling the admission of thetemperature changing medium to such inclosure, means for admitting thehumidity changing medium to each of said inclosures, and means in eachinclosure influenced by the relative humidity therein for automaticallycontrolling such admission for such inclosure..

11. In a device of the character stated; a

source of temperature changing medium supply and a source of humiditychanging medium supply, a plurality of ducts for respectively conveyingthe mixed supply of such media to each of a plurality of inclosures, acold or tempered air duct communicating With each supply duct, dampersin the several ducts for controlling the mixing of the temperaturechanging medium and the cold or tempered air, a discharge outlet in eachcombined duct for the humidity changing medium, means for respectivelycontrolling the operation of said dampers and said humidity dischargeoutlets, and means in each room for independently controlling theactuation of said,dampers and said discharge means whereby thetemperature and humidity in each room are independently maintained atpredetermined fixed points.

spectively conveying the mixed supply of such media to each of a numberof rooms, a cold or tempered air duct communicating \v1th each supplyduct, dampers n the several ducts for controlling the mixture of thetemperature changing medium and cold or tempered air, a discharge outletin each combined duct for the humidity changing medium, means controlledby pressure fluid for respectively controlling the operation of saiddampers and said humidity discharge outlets, a source of pressure fluidsupply, electrically controlled means for respectively controlling thepressure fluid controlling means, and means in each room forindependently actuating the electrically controlled means relating tothe supplies for that room.

13. In a device of the character stated, a source of temperaturechanging medium supply and a source of humidity changing medium supply,a plurality of ducts for respectively conveying the mixed supply of suchmedia to each of a number of inclosures, a cold or tempered air ductcommunicating with each supply duct, and aut0- matic means controlled bythe temperature and humidityin each of said rooms for respectivelyregulating the supply of the mixed temperature changing medium and coldor tempered air and the humidity supply to that room.

14. In a device of the character stated, a source of temperaturechanging medium supply and a source of humidity changing medium supply,a plurality of ducts for respectively conveying the mixed supply of suchmedia to each of a number of rooms, a cold or tempered air ductcommunicatin With each supply duct, means controlle by pressure fluidfor respectively controlling the supply of mixed temperature changtilting medium and cold or tempered air and said humidity supply,electrically controlled valves for controlling said pressure fluid, andindependentmeans'in each room operable respectively by changes intemperature and humidity in the same and connected to independentlycontrol the actuation of each of said electrically controlled valves ineach respective room. a

15. In a device of the character stated,

a source of temperature changing medium supply and a sourceof humiditychanging.

medium supply, a plurality of ducts for respectively conveying the mixedsupply of such media to each of a number of inclosures, a cold ortempered air'duct communieating with each supply duct, automatic meanscontrolled by the temperature and relative humidity in each of saidinclosures for respectively regulating the supply of mixed temperaturechanging medium and cold' or tempered air and the humidity changingmedium to that inclosure, and

-means'automatically actuated by the simultaneous atmospheric conditionsin all of said inclosures for controlling the main source of supply ofthe temperature changing medium or the humidity changing medium. v

16. In a device of the character stated, a source of temperaturechanging medium supply and a source of humidity changing medium supply,each in communication with a plurality of inclosures, means actuated bypressure fluid for regulating the supply of' each of said mediums to therespective 1nclosures, a source of pressure fluid, a plurality of valvesfor respectively controlling the pressure fluid to said means, anelectromagnet suitably connected to each of said valves, a circuit foreach of said electromagnets, and means located in each inclosure andcontrolled by atmospheric conditions therein for closing circuits to theelectromagnets for that inclosure, and means actuated by thesimultaneous atmospheric conditions in all of said inclosures forcontrolling the main source of supply of the temperature changingmedium. i

17. In a device of the character stated, a source of temperaturechanging medium supply and a source of humidity changing medium supply,a plurality of ducts for re spectively conveying a mixture of said mediato each of a number of inclosures, a cold or tempered air ductcommunicating With each supply duct, dampers in the several ducts forcontrolling the mixing of the temperature controlling medium and thecold or tempered air, a discharge in each combined duct for the humiditychanging medium, means controlled by the temperature of each inclosurefor automatically maintaining said dampers in motion to automaticallymix the temperature changing medium and cold or tempered air supply forthat inclosure, and means for automatically regulating the supply ofhumidity changing medium to each of said inclosures, and means forautomatically regu lating the supply of humidity changing medium to allof said inclosures.

18. In a device of the character stated, a source of temperaturechanging medium supply and a source of humidity changing medium supply,a plurality of ducts for respectively conveying a mixture of said mediato each of a number of inclosures, acold or tempered air ductcommumcatmg Wlth each valves for controlling said pressure fluid,independent means in each inclosure operable respectively by changes intemperature and humidity for controlling the actuation of' saidelectrically controlled valves, and means ing medium respectively meanscontrolled by the operation of said mdependent means for regulating thefuel consumption of said 15 temperature changing medium supply and saidhumidity changing medium supply, and

electrically controlled indicators operable by said independent meansfor indicating which independent means is in operation.

FRANK D. WINDELL.

. Witnesses:

C. D. MCVAY, N. BUSSINGER.

